Inhibition of human active MMP2 using (7-methoxycoumarin-4-yl)acetyl-Pro-Leu-Gly-Leu-(3-(2,4-dinitrophenyl)-L-2,3-diamino-propionyl)Ala-Arg-NH2 as substrate preincubated for 30 mins followed by substrate addition and measured for 10 mins by fluorescence assay